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Scan protocol optimisation : collimation
In multi slice CT, narrow collimations result in higher dose due to ‘overbeaming’ in z-axis
- Avoid imaging using the penumbra of the beam
- Effect is less significant at wider collimations, and
for 16 slice than 4 slice at same image width
- e.g. GE LightSpeed, LightSpeed Ultra and
LightSpeed 16